The phrase "underlying item" is correct and usable in written English.
It can be used when referring to a fundamental or basic component that supports or is the basis for something else.
Example: "The underlying item in this analysis is the data set that drives our conclusions."
Alternatives: "fundamental element" or "core component".
Using the Local Independence assumption underlying Item Response Theory (IRT), the marginal likelihood is expressed as (2) with G the normal distribution function.
The assumption underlying item development was the creation of sufficient items to cover each concept revealed during domain identification, but the major approach to factor analysis in this study was exploratory, to determine the underlying structure.
In our validation analyses, we examined the extent to which the theoretical construct explained the test scores and the underlying item response processes.
In short, we used factor analysis to examine underlying item structure and to assess IRT model assumptions.
A closer analysis of the underlying item revealed that the change in "Conflict" was equally due to the change in both underlying items (Table 3).
We therefore also preferred an approach that avoids LID by the design of the underlying items instead of an approach based on modeling.
Requested production rates of sales items, or alternative prefabricated modules in stock, are "broken down", exploded, to create the need for components, for all underlying items (articles) in the Bill of Material.
The importance of each indicator was calculated as the mean importance of the underlying items.
Table 2 summarises the health dimensions assessed by AQoL and their underlying items for respondents aged 75 and over.
The underlying items, factor loadings and eigenvalues of the instrument that emerged after principal factor analysis with promax rotation and based on Kaiser's criterion and scree plot inspection are presented in Additional file 1 as background information.
The responsiveness of the GPEQ was assessed for GPs evaluating Hamar community mental health centre from Stange municipality in 2006 and 2008 who were included in a quality improvement initiative expected to improve the guidance scale and underlying items for the intervention group.
